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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaf8dc0fabb48ce9f2abf915da632e631aad677cff0959f96603de594fbccc1' 
  AND token = 'uAIiX2p+TIpBlyNaGmlrTurN6wQX096IO7YA06EZM+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}